采石场粉尘和海砂混合物力学性能试验和数值研究

Experimental and numerical study on mechanical properties of rock quarry dust and sea sand mixtures

越南等发展中国家的道路基础设施建设需要大量天然砂。河砂日益紧缺,其供应量将持续下降。因此,建筑行业必须实施可持续发展战略,将废弃材料与各种可利用资源相结合,以有效应对这一严峻形势。本研究的目的是测试采石场粉尘和海砂混合物的力学性能,并评估其在高速公路路基层中的潜在应用。进行了一系列试验,包括材料的含水率、相对密度、休止角测试和三轴试验,以研究不同配比下混合物的组成。结合Plaxis土工试验中的校准进行了广泛的参数研究,得出了割线模量E_(50)和围压曲线。根据加州承载比CBR对公路路基层所用材料的评估结果,证明海砂和采石场粉尘混合物具有适当性能,可用于公路路基的建设。

Road infrastructure construction in developing countries such as Vietnam requires an enormous amount of natural sand.The scarcity of river sand is becoming increasingly severe,with predictions indicating a sustained drop in its supply.Hence,it is essential for the construction industry to implement a sustainable strategy by combining waste materials with abundant resources in order to effectively address this challenging situation.The objective of this study is to investigate the mechanical properties and evaluate the potential application of mixtures comprising rock quarry dust and sea sand for the roadbed layers of expressways.The researchers conducted a series of experiments,including the moisture content,specific gravity,angle of repose of material,and triaxial tests to study the composition and mechanical behaviors of mixtures at different ratios.Extensive parametric investigations in conjunction with the calibration in Plaxis’soil-test module obtain the Young’s modulus E_(50)and confining pressure curves.Based on the assessment of materials utilized in roadbed layer of highway,as determined by the California bearing ratio(CBR)coefficient,it demonstrates that combining sea sand and quarry dust can generate the mixtures possessing appropriate properties for application in the construction of the roadbed of highway.